Value cannot be null. Parameter name: connectionString appsettings.json in starter

Question

I am trying to write my connection string in my appsettings.json file and bring it into my startup file but I keep getting a Value cannot be null. Parameter name: connection

Answer 1

this is was the message that appeared me

Value cannot be null. Parameter name: connectionString

I fix it changed in the startup these lines

services.AddDbContext<AppIdentityDbContext>(options =>
options.UseSqlServer(
Configuration["Data:BookStoreContext:ConnectionString"]));

To

services.AddDbContext<AppIdentityDbContext>(options =>
options.UseSqlServer(
Configuration.GetConnectionString("BookStoreContext")));

Answer 2

Maybe you can try this:

services.AddDbContext<ApplicationDbContext>(options =>
    options.UseSqlServer("DefaultConnection")
);

Then set your appsettings.json do something like this:

"ConnectionStrings:": {
    "DefaultConnection": "Server=(localdb)\\MSSQLLocalDB;Database=HOME1_DATABASE;Trusted_Connection=True;MultipleActiveResultSets=true"
},

After that, when a I add migration via the console, it succeeds.